Linking Speleothem And Soil Magnetism In The Pau D'alho Cave (central South America)

dc.creatorJaqueto
dc.creatorPlinio; Trindade
dc.creatorRicardo I. F.; Hartmann
dc.creatorGelvam A.; Novello
dc.creatorValdir F.; Cruz
dc.creatorFrancisco W.; Karmann
dc.creatorIvo; Strauss
dc.creatorBecky E.; Feinberg
dc.creatorJoshua M.
dc.date2016
dc.dateout
dc.date2017-11-13T13:44:56Z
dc.date2017-11-13T13:44:56Z
dc.date.accessioned2018-03-29T05:59:35Z
dc.date.available2018-03-29T05:59:35Z
dc.identifierJournal Of Geophysical Research-solid Earth. Amer Geophysical Union, v. 121, p. 7024 - 7039, 2016.
dc.identifier2169-9313
dc.identifier2169-9356
dc.identifierWOS:000388441800003
dc.identifier10.1002/2016JB013541
dc.identifierhttp://onlinelibrary.wiley.com/doi/10.1002/2016JB013541/full
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/328892
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1365917
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionMineral magnetism of Pau d'Alho cave sediments, soils outside the cave, and in the stalagmite #6 (ALHO6) in Midwest Brazil is presented. This high growth-rate speleothem (similar to 168 mm/ka) encompasses the past 1355 years. Oxygen and carbon isotope data from the same stalagmite allow for a direct comparison of the magnetic signal with changes in paleoprecipitation and soil dynamics at the surface. Magnetic experiments include isothermal remanent magnetization, anhysteretic remanent magnetization, hysteresis loops, first-order reversal curves, and low-temperature superconducting quantum interference device magnetometry. The main magnetic remanence carriers in ALHO6 are magnetite and goethite, with a nearly constant relative proportion. Remanent coercivities of magnetite in all our samples are within 14-17mT for an average grain-size of similar to 1-2 mu m, in the range of pedogenic magnetite, thus suggesting the detrital grains deposited in the stalagmite were produced in the soil above the cave. Magnetic remanence variations follow delta C-13 and delta O-18 data, suggesting a climatic control on the input of magnetic minerals into the Pau d'Alho cave system. The concentration of magnetic minerals in the stalagmite is governed by soil erosion above the cave, which by its turn is controlled by soil erosion and vegetation cover. Dry periods are associated with less stable soils and result in higher mineral fluxes carried into karst systems. Conversely, wetter periods are associated with soils topped by denser vegetation that retains micrometer-scale pedogenic minerals and thus reduces detrital fluxes into the cave.
dc.description121
dc.description10
dc.description7024
dc.description7039
dc.descriptionCAPES
dc.descriptionNSF
dc.descriptionCNPq/Brazil PQ [304934/2014-3]
dc.descriptionCAPES [2043/2014]
dc.descriptionCNPq/Brazil [454609/2014-0]
dc.descriptionSao Paulo Research Foundation, FAPESP [2012/03942-4]
dc.descriptionNASA/FAPESP [2012/50260-6, 2013/50297]
dc.descriptionFAPESP [2012/01187-4]
dc.description[NSF-EAR-1316385]
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageEnglish
dc.publisherAmer Geophysical Union
dc.publisherWashington
dc.relationJournal of Geophysical Research-Solid Earth
dc.rightsfechado
dc.sourceWOS
dc.subjectElectron-microscopy
dc.subjectStalagmite
dc.subjectRock
dc.subjectPaleomagnetism
dc.subjectMinerals
dc.subjectMagnetization
dc.subjectCoercivity
dc.subjectComponents
dc.subjectPaleosols
dc.subjectEemanence
dc.titleLinking Speleothem And Soil Magnetism In The Pau D'alho Cave (central South America)
dc.typeArtículos de revistas


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